At the heart of mostof the corporate and organizational networks is Active Directory (AD). You use AD as an authentication and authorization platform. AD first debuted with Windows 2000. Microsoft improved it with each successive release of Windows Server.
In the early days of AD, you promoted a server computer to act as a domain controller by using the  DCPromo.exe utility. In Server 2016, this command no longer exists. Instead of DCPromo, you could either use Server Manager or PowerShell.
This recipe shows how you use PowerShell to upgrade systems to be domain controllers. This recipe creates two servers (DC1 and a replica DC, DC2) in the Reskit.Org domain. After you complete this recipe, your forest has only one domain, but you could easily extend this recipe to create multi-domain forests.
